Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NOCB1B1B |
| Power Supply | +5V DC @ 3.8A, +15V DC @ 0.7A, -15V DC @ 0.5A |
| Temperature Inputs | 4 thermocouple channels (Type J/K/T, 16-bit ADC, ±1°C accuracy) |
| SS Outputs | 8 solid-state relays, 2A continuous @ 24–48VDC |
| Relay Outputs | 4 mechanical relays, 5A continuous @ 115VAC/30VDC (surge 10A) |
| Tachometer Inputs | None |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | -20°C to +65°C |
| LED Indicators | Power, SS Run (8x green), Relay Run (4x amber), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
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Solid-State-Primary Hybrid Architecture: 8 solid-state DC outputs + 4 mechanical relays on a single board.
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Higher Relay Current (5A): Supports larger AC/DC auxiliary loads compared to 3A hybrid boards.
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Fan-Dense Design: 8 SS outputs + 4 relay outputs with only 4 temperature inputs—optimized for single-zone cooling.
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Improved Temperature Accuracy (16-bit ADC): ±1°C accuracy—double the precision of the base 12-bit (±2°C) model.
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Extended Temperature Range: -20°C to +65°C supports moderately harsh environments.
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Silent, Maintenance-Free Solid-State Outputs: Unlimited cycle life for DC fans.
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Relay Auxiliary Outputs: 2500V galvanic isolation for AC/DC auxiliary loads.
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Low EMI Emissions: Solid-state outputs minimize interference with sensitive cards.
Typical Application Fields
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Fan-Dense Mixed Fan Cabinets: Where DC fans are primary with higher-power AC/DC auxiliary devices.
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Unheated Shelters & Outdoor Enclosures: -20°C to +65°C range.
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Moderately Harsh Environments: Where climate control is limited.
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High-Power Auxiliary Applications: 5A relay capacity for larger contactors or alarms.
Comparison with Related Models
| Feature | DS3800NOCB1B1B | DS3800NOCA1B1B | DS3800NOAA | DS3800NMEC1B1A |
|---|---|---|---|---|
| SS Outputs | 8 × 2A | 8 × 2A | 8 × 2A | 4 × 2A |
| Relay Outputs | 4 × 5A | 4 × 3A | 4 × 3A | 8 × 5A |
| T/C Inputs | 4 | 4 | 4 | 4 |
| Tach Inputs | None | None | 2 channels | None |
| ADC Resolution | 16-bit (±1°C) | 16-bit (±1°C) | 12-bit (±2°C) | 16-bit (±1°C) |
| Operating Temp | -20°C to +65°C | -20°C to +65°C | 0°C to +60°C | 0°C to +60°C |
| Firmware | B | B | A/B | B |
| Cost | Medium-High | Medium | Medium | Medium |
Selection Recommendations
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Choose the DS3800NOCB1B1B if:
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You need 8 solid-state DC outputs (2A) for main fans.
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You also need 4 mechanical relay outputs (5A) for higher-power auxiliary devices.
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You want improved temperature accuracy (±1°C).
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Your installation requires extended temperature range (-20°C to +65°C).
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Your cabinet uses 4 temperature sensors for 12 total outputs (fan-dense configuration).
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You do not require tachometer feedback.
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Choose the DS3800NOCA1B1B if: You need 3A relay outputs instead of 5A.
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Choose the DS3800NOAA if: You need tachometer feedback with the same hybrid outputs.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap.
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DC Polarity (SS): Solid-state outputs are DC-only and polarity-sensitive—reverse polarity destroys the MOSFET.
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SS Voltage Limit: Do not exceed 48VDC—AC voltages cause catastrophic failure.
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High-Voltage/Current Hazard (Relay): Relay outputs switch 115VAC/5A—lethal. Use proper insulation.
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Relay Inductive Derating: For inductive loads, derate from 5A to 3.5A or use RC snubbers.
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Missing T/C Channels: Only 4 thermocouple inputs (channels 1–4). Channels 5–8 are physically absent.
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No Tachometer Inputs: Do not connect speed sensors.
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No Hot-Swap: Always depower the rack before insertion/removal.
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Slot Assignment: Install in slots 8–10 (auxiliary I/O).
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CPU Dependency: If backplane communication is lost, the board defaults to 100% fan speed.
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Firmware Compatibility: Revision B firmware is compatible with Mark V CPU firmware v4.0 and above. For v3.x, the enhanced ADC accuracy may be partially disabled—confirm compatibility before purchasing.
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